When you have model lock in, it’s a big detriment to use because if anyone comes out with SOTA models, and you have already invested infra development on this, you are stuck. Even if you open it up, it’s likely not to work as your model is likely trained specifically on that CLI. Just look at Codex CLI, you can use Gemini 2.5 pro, but it will get randomly stuck or fail a lot vs OpenAI models